SYNAPSE — also called neuronal junction the site of transmission of electric nerve impulses between two nerve cells (neurons) or between a …Britannica English vocabulary

SEX CHROMOSOME — either of a pair of chromosomes that determine whether an individual is male or female. The sex chromosomes of human …Britannica English vocabulary

PHOTOSENSITIZATION — the process of initiating a reaction through the use of a substance capable of absorbing light and transferring the energy …Britannica English vocabulary

GENE — unit of hereditary information that occupies a fixed position (locus) on a chromosome. Genes achieve their effects by directing the …Britannica English vocabulary

WACO — city, seat (1850) of McLennan county, north-central Texas, U.S. Waco lies along the Brazos River, 97 miles (156 km) south …Britannica English vocabulary

TITAN ROCKET — any of a series of U.S. rockets that were originally developed as intercontinental ballistic missiles (ICBMs) but were also used …Britannica English vocabulary

NIKE MISSILE — any of a group of U.S. surface-to-air missiles designed in the 1940s and '50s for defense against air attack. The …Britannica English vocabulary

LIBERTY, STATUE OF — formally Liberty Enlightening the World, colossal statue on Liberty Island in the Upper New York Bay, U.S., commemorating the friendship …Britannica English vocabulary

BARSTOW — city, San Bernardino county, south-central California, U.S., in the Mojave Desert. Lying at a junction of pioneer trails, Barstow was …Britannica English vocabulary

FUSE — ( fuses, fusing, fused) 1. A fuse is a safety device in an electric plug or circuit. It contains a …Collins COBUILD Advanced Learner's English Dictionary

DEACTIVATE — ( deactivates, deactivating, deactivated) If someone deactivates an explosive device or an alarm, they make it harmless or impossible to …Collins COBUILD Advanced Learner's English Dictionary